Now I know the cost of the overhaul from the Robbo site and in theory the calc should be resale price of a newly renovated Raven 1 on its second time around the block, less the cost of the rebuild (US$156,000 according to Robbo), lets call this the Old Hull Price
... less the 'risk cost' of anything which isn't in the standard 1st rebuild cost, but which robinson decides does need replacing, e.g (if I remember rightly) the tailcone.
Any (sane) buyer will want to discount the risk out of the price...
Lafite